<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>css03-class</title>
<link href="css03.css" rel="stylesheet" type="text/css">
</head>

<body>
	<div>这是div容器1</div>
	<div>这是div容器2</div>
	<div>这是div容器3</div>
</body>
</html>
